PDF malware analysis — malicious · c40db893b29e0258

MALICIOUS

PDF

6.7 KB

MD5: 137e246c8d6e1b0001dc4d8b4a0cbf5f SHA-1: eb9b4365dbe35cb3f99fa170a6c4ebad9b3487af SHA-256: c40db893b29e0258432aba8d3e5f7ad6c51062d58e20032169aceccb7caf65e6

266 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF file contains embedded JavaScript that leverages multiple known exploits (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) to achieve code execution. The JavaScript is obfuscated and appears to be designed to download and execute a second-stage payload, as indicated by the ClamAV detection 'Js.Exploit.Shellcode-18'. The file's structure and the nature of the exploits suggest a malicious intent to compromise the user's system.

Heuristics 8

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0039_000.js` `9f29e9e3a49a2c2d7ef2b262d7dd0ce4b925dc0fd6507ffda8bf9d0afb65d8ac`	pdf-javascript-stream	PDF /JS object 39 at offset 0x16F	20332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `5b9713b24ca2f3ad63839b771c3e3c53bdc066d7fc4958eaf906da5deae096f6`	deobfuscated-js	numeric array XOR decoded JavaScript at offset 0x16F	5344 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `1498a25280444fc9e04889a0622422b714ff4dc559d344fcc836b48a36a0ed2e`	deobfuscated-js	numPages XOR decoded JavaScript at offset 0x16F	5344 bytes

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